Sawa Takigawa is a recurring supporting character in Kamen Rider Build. She is an investigative journalist who works to uncover the truth behind the mysterious events surrounding the Sky Wall, the Nebula Gas incidents, and the conflict between the Three Nations. Intelligent, determined, and resourceful, she often acts as a bridge between the main cast and the wider world. She supports the heroes by gathering information, exposing conspiracies, and helping reveal the motives of key organizations.